Development of new P-chiral P,π-dihydrobenzooxaphosphole hybrid ligands for asymmetric catalysis

Org Lett. 2014 Oct 17;16(20):5494-7. doi: 10.1021/ol5027798. Epub 2014 Oct 9.

Abstract

A new family of P-chiral P,π-hybrid ligands was prepared from the dihydrobenzooxaphosphole core. These new ligands were demonstrated to be both sterically and electronically tunable at the substituents on the phosphorus atom and the π-system of the ligand. Application of these new ligands to the catalytic asymmetric addition of boronic acids to imine electrophiles was shown to proceed with high levels of enantioinduction.